What are those environmental conditions that may affect the life and growth of bacteria?

What are those environmental conditions that may affect the life and growth of bacteria?

The main growth factors are temperature, humidity, concentration of hydrogen ions in the environment, oxidoreduction potential, water activity in the environment, and hydrostatic pressure [5].

How do bacteria survive in harsh environment?

Numerous strategies exist in bacteria to cope with stressful conditions including the formation of cysts and spores, changes in cellular membranes, expression of repair enzymes for damage, synthesis of molecules for relieving stresses, and so forth (38).

Can bacteria survive in harsh conditions?

There are two kinds of prokaryotes — the familiar bacteria, and the archaea, many of which thrive in harsh environments such as hot springs, salt lakes, underground petroleum deposits and deep-sea hydrothermal vents.

Why can bacteria survive in extreme conditions?

Almost all prokaryotes have a cell wall, a protective structure that allows them to survive in both hypertonic and hypotonic aqueous conditions. Some soil bacteria are able to form endospores that resist heat and drought, thereby allowing the organism to survive until favorable conditions recur.

Can bacteria survive fire?

“Some germs, known as hyperthermophilic bacteria, grow in very hot temperatures up to 250°F. However, most bacteria and viruses that are pathogenic to humans can be killed through a heat of 165ºF or higher within minutes of cooking.”

What temperature does bacteria start to grow?

Bacteria grow most rapidly in the range of temperatures between 40 °F and 140 °F, doubling in number in as little as 20 minutes.

Why does bacteria growth better in warm temperature?

At lower temperatures molecules move slower, enzymes cannot mediate in chemical reactions, and eventually the viscosity of the cell interior brings all activity to a halt. As the temperature increases, molecules move faster, enzymes speed up metabolism and cells rapidly increase in size.

What happens to bacteria at low temperatures?

At temperatures below their optimum for growth microorganisms will become increasingly unable to sequester substrates from their environment because of lowered affinity, exacerbating the anyway near-starvation conditions in many natural environments.

What happens to bacteria at 5 degrees?

0 to 5 degrees c – Bacteria are ‘sleeping’ and reproduce very slowly. 5 to 63 degrees c – Bacteria produce most actively. 72 degrees c – The bacteria start to get destroyed and are unable to reproduce. Food – Bacteria grow best on high risk foods (foods that have a high protein and water content).

Where do harmful bacteria live?

There are many bacteria in the human body, especially in the stomach and mouth. Bacteria are found on surfaces and in substances such as water, soil, and food.